Observation 25849: Amanita bisporigera G.F. Atk.

When: 2009-08-30

Collection location: Gifford Pinchot State Park, York Co., Pennsylvania, USA [Click for map]

Who: kate (kate)

No specimen available

I found this pure white mushroom in two pieces apparently disturbed before I happended upon it. The stipe was still in the ground the cap was about 12 to 20 inches away. This mushroom has a long somewhat narrow stipe approximately 11cm in length with a visable ring with a rather shaggy texture VS smooth. The stipe has a solid core fiberous in appearance. The cap is shiny white and smooth roughly 5 to 6 cm in width. The most outstanding feature that caught my eye was the fact that it was totaly white. I really didn’t take detailed pictures of it do to its condition when I found it. Regretably I didn’t take a shot of the gills. Other notes found growing on rocky soil in somewhat of a grassy clearing with nearby hardwood trees largely oaks with a north facing exposure. I am including another image of an all white imature mushroom that was in close proximity to the more mature example which has the same characteristics sans a ring on the stipe.

[admin – Sat Aug 14 02:00:41 +0000 2010]: Changed location name from ‘Gifford Pinchot State Park, YORK COUNTY, PENNSYLVANIA’ to ‘Gifford Pinchot State Park, York Co., Pennsylvania, USA


Pure white Shaggy stipe with ring
This is how I found it.
Small imature version of the larger mature example

Proposed Names

54% (1)
Recognized by sight
Used references: Smimon & Shusster’s guide to Mushrooms Smithsonians Handbook Mushrooms National Audubon Society field Guide to Mushrooms
82% (1)
Recognized by sight: A. Virosa is a European species just went through all this with one that found. The litterateur stated that A virosa has 4 spores per basidium where as A Bisporigera has Two spores per basidum That according to Roody but further reading of Tullose states that A bisporigera can be found with both two spores per basidium and 4 spores per basidium depending on the time of year. The common Destroying angle in the East is A bisporigera.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
any micorscope will do
By: Eddee (eddeeee)
2009-09-27 22:39:32 CDT (-0400)
You can use any micorscope that you want. If you going to get serious with the fungi thing you need a Microscope. It doesn’t have to be great. YOU can find a used one on E bay. or hit up some animal hospitals that might have one that is laying around that they might want to sell that is how i got mine OR just go to a hobby shop and see if they have like a 100 $ one. With a scope you can look at spores and do all kinds of cool stuff. To look at the basidium just take a small section of the gill. place it on a slide I put a drop of diluted Iodine on it. And a cover slip. I prefer that. It brings out the structures better.Also lets me know if the spores are dexinoid or amyloid. After it is stained then you can see the basidium with high power feild. ITs very easy and you seem very intelligent. Ok take care. Eddee
its ussually late in the year
By: Eddee (eddeeee)
2009-09-27 21:19:55 CDT (-0400)

From my understanding it is usually later on in the year that a this Occurs. Possibly due to temperature change. It has been cooler in my neck of the woods and I am seeing a lot Of A Bisporiger That have 4 spores per basidium.

What would cause the disparity in the basidium?
By: kate (kate)
2009-09-27 10:40:42 CDT (-0400)

I find the disparity too fascinating that this Amanita bisporigera can modulate the number of spores per basidium. What is the conjecture or current thinking as to why and how this evolved? Survival? Very curious.

Created: 2009-09-27 02:11:46 CDT (-0400)
Last modified: 2011-03-01 20:49:48 CST (-0500)
Viewed: 76 times, last viewed: 2018-09-08 00:53:32 CDT (-0400)
Show Log